Automated Photoluminescence Experimentation for Understanding Dynamic Metal-Halide Perovskite Semiconductors

Alexander Kiligaridis

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

103 Nedladdningar (Pure)

Sammanfattning

Metal halide perovskites have garnered significant attention for their remarkable optoelectronic properties and unique photophysical characteristics. Combined with low cost for fabrication, this new class of materials is among the most promising candidates within next generation photovoltaic technologies. However, the complex nature of metal halide perovskites' crystal structures and compositions requires precise control during synthesis to achieve desired properties. Small variations in composition can significantly impact the material's behavior, demanding meticulous experimentation and characterization. Another challenge associated with the research of perovskite metal halides is the
observer effect, a concept most often associated with quantum mechanics and refers to the alteration of a state by the act of observing it. In the context of perovskite materials, the very act of measurement or characterization can influence the material’s behavior, potentially leading to discrepancies between observed and actual properties. Photoluminescence spectroscopy is a powerful analytical technique that plays a pivotal role in unraveling the optical properties and electronic behavior of perovskite materials. The emission of light upon excitation provides insights into the material’s band structure, defect states and recombination dynamics. This thesis presents a comprehensive exploration of the convergence between photoluminescence spectroscopy and automation testing techniques, tailored to the specific requirements of metal halide perovskite materials. The integration of these two domains offers a novel approach to accelerate the characterization of the optoelectronic properties of metal halide perovskites. The integration of automation not only enhances the efficiency of experimentation but also enables the exploration of a wider parameter space. One of the examples that we will present in this work is a novel experimental methodology, incorporating photoluminescence measurements within a two-dimensional parameter space of excitation energy and laser pulse repetition frequency. We demonstrate the effectiveness of this technique in comprehensively investigating the dynamic photochemical properties of our material due to sample aging and degradation, photo-induced reversible and irreversible processes during the act of measuring.
Originalspråkengelska
KvalifikationDoktor
Handledare
  • Scheblykin, Ivan, handledare
  • Uhlig, Jens, Biträdande handledare
Tilldelningsdatum2023 nov. 20
Förlag
ISBN (tryckt)978-91-7422-998-1
ISBN (elektroniskt)978-91-7422-999-8
StatusPublished - 2023

Bibliografisk information

Defence details
Date: 2023-11-20
Time: 09:00
Place: KC:B
External reviewer(s)
Name: Kirchartz, Thomas
Title: Professor
Affiliation: Department of Analytics and Simulation, University Duisburg-Essen
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Ämnesklassifikation (UKÄ)

  • Materialkemi

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